Loom



A. JOHN July 19, 1927.

LOOM

Filed April 5, 1926 czi Patented July 19, 1927.

crates ALFRED JOHN, 015 GERA-REUSS, GERMANY.

Application filed April 5, 1926, Serial No.

The present invention has reference to improvements in looms and relates more specilically to a new and improved accessory mechanism for operating the lay, and the particular object of the invention is to provide means in looms, and especially power looms, for so controlling the operative reciprocation of the lay that the operatively useless portion of the beat is negotiated quicker than the operatively useful portion thereof, for the purpose of improving the shuttle plying operation and generally speeding up the loom operation.

Whereas in the prior art eccentric gears were proposed for a similar purpose I secure on the crank shaft which operates the lay alongitudinally slot ted crank arm and cause a driver pin, which extends laterally from a rotary member to engage in-the slot of this crank arm, the rotary member being positively driven at uniform speed in any suitable manner, and its axis lying more or less eccentrically to the axis of the crank shaft, which latter, then, is driven at uniformly increasing and decreasing speeds during each cycle or loom beat.

in order to make my invention readily understood. 1 will now describe it in detail in connection with the accompanying drawing, in which Fig. 1 is a side elevation of the mechanism, and Figs. 2 and 3 are similar top iews, with the parts in different operative positions.

The drive shaft 1 of the loom is journaled in the frame parts 2 and 3. A spur gear fixed on the shaft 1 and a spur gear 5 nrnalezl in the frame part 3 in meshelation with the first said gear 4. ind of the spur gear 5. I may use a crank arm or other suitable driving means, as will be readily understood. From the inside of the 5 extends laterally a driver pin 6. The crank shaft 9, which is suitably journaled in the loom frame and to which the lay rod is linked in the well known manner and for the well known purpose carries at its outer end a crank arm 8 in which a longitudinally extending slot- 7 is provided,

99,686, and in Germany October 29, 1925.

adapted, to receive the driving pin 6, as clearly shown in the drawing. The shaft of the gear 5 is adjustably eccentrically journaled relative to the crank shaft, with the result that on the gear 5 being rotated at a uniform speed, its pin 6 will rotate the crank shaft with a constantly changing leverage at varying speeds depending upon the momentary distance between pin axis and crank shaft axis. The lay, then, will correspondingly be actuated and its varying speeds can be so timed relative to the shuttle plying operation that the operatively useless portion of thelay course or beat is traveled through quicker than the useful portion, and this withoutany'change in the speed of the drive shaft.

By varying the eccentricity of the gear 5, or of thepin 6 thereon, relative to the crank shaft, the degree of the changes in the rotary speed of the crank shaft can be altered to suit obtaining requirements.

The principle of the invention, ohviously, can also be applied in connection with looms having no crank shaft.

What I claim as my invention is In a loom drive of the character set forth, in combination with the loom frame and a lay mounted therein for reciprocation, a drive shaft adapted to be driven at constant speed, a crank shaft designed for operating the lay, and means interposed between said two shafts for uniformly varying the rotary speed of said crank shaft in each operative cycle, comprising a spur gear fixed on said drive shaft, a spur gear rotatably journaled on the loom frame in adjustable eccentricity to said crankshaft and meshing with the first said spur gear, a driver pin laterallyadjustably extending from the second said spur gear, a crank arm Fixed on said crank shaft presenting a longitudihal slot, and said driver pin engaging in said crank arm slot for sliding cooperation therein.

In testimony whereof I affix my signature.

ALFRED JOHN. 

